Clock



FIG. 1 is a Front Perspective view of a clock, showing our new design;

FIG. 2 is a Front Elevational view thereof,

FIG. 3 is a Top Plan view thereof,

FIG. 4 is a Rear Elevational view thereof,

FIG. 5 is a Bottom Plan view thereof,

FIG. 6 is a Left Side Elevational view thereof; and,

FIG. 7 is a Right Side Elevational view thereof. 

We claim the ornamental design for a clock, as shown and described. 